Harq Llr Buffer and Reordering Buffer Management

1. A method to reduce buffer overhead, comprising: receiving packets comprising an initial transmission and at least one incremental redundancy hybrid automatic repeat request (IR-HARQ) retransmission; forming a plurality of log likelihood ratios (LLRs) based on the packets; compressing the plurality of LLRs, including: quantizing groups of five LLRs to three levels each; and mapping each group of five quantized three-level LLRs to eight bits using a lookup table (LUT); and buffering the compressed plurality of LLRs.

2. The method of claim 1 , wherein the compressing the plurality of LLRs comprises: quantizing the plurality of LLRs to a non-uniform multiple-level quantization.

3. A method to reduce buffer overhead, comprising: receiving packets comprising an initial transmission and at least one incremental redundancy hybrid automatic repeat request (IR-HARQ) retransmission; forming a plurality of log likelihood ratios (LLRs) based on the packets; compressing the plurality of LLRs, including: quantizing a first LLR to three levels; quantizing a second LLR to five levels; and mapping the first quantized three-level LLR and the second quantized five-level LLR to four bits using a lookup table (LUT); and buffering the compressed plurality of LLRs.

4. The method of claim 1 , further comprising combining the buffered compressed plurality of LLRs using IR combining.

5. The method of claim 1 , wherein the buffered compressed plurality of LLRs comprise systematic bits and redundancy bits.

6. The method of claim 1 , wherein: receiving the packets comprises receiving the packets at a receive processor of a user equipment (UE), buffering the compressed LLRs comprises storing the compressed LLRs in one or more buffers of the UE, and the method further comprises signaling, to a base station (BS), a capability of the UE to perform the LLR compression.

7. The method of claim 1 , further comprising: signaling, to a base station (BS), a preferred minimum code rate, after HARQ transmissions, and a maximum soft buffer size.

8. A method to reduce buffer overhead, comprising: receiving a radio link control (RLC) retransmission comprising one or more transmission blocks on at least one of multiple component carriers (CCs) or multiple hybrid automatic repeat request (HARQ) interlaces; receiving at least one RLC parity packet associated with the RLC retransmission on at least one of a different CC or a different HARQ interlace than the RLC retransmission; attempting to decode the one or more transmission blocks; determining whether the one or more transmission blocks were successfully decoded; storing soft log likelihood ratios (LLRs) associated with transmission blocks that failed to successfully decode in a shared buffer; and storing transmission blocks that were successfully decoded out-of-order in the shared buffer.

9. The method of claim 8 , wherein the shared buffer comprises a joint HARQ LLR and radio link control (RLC) reordering buffer.

10. The method of claim 8 , wherein the shared buffer comprises dynamic partitioning memory.

11. The method of claim 8 , further comprising: signaling, to a base station (BS), a capability to store LLRs and transmission blocks that were successfully decoded out-of-order in the shared buffer.

12. An apparatus having reduced buffer overhead, comprising: means for receiving packets comprising an initial transmission and at least one incremental redundancy hybrid automatic repeat request (IR-HARQ) retransmission; means for forming a plurality of log likelihood ratios (LLRs) based on the packets; means for compressing the plurality of LLRs, including: quantizing groups of five LLRs to three levels each; and mapping each group of five quantized three-level LLRs to eight bits using a lookup table (LUT); and means for buffering the compressed plurality of LLRs.

13. The apparatus of claim 12 , wherein the means for compressing the plurality of LLRs comprises: means for quantizing the plurality of LLRs to a non-uniform multiple-level quantization.

14. An apparatus having reduced buffer overhead, comprising: means for receiving packets comprising an initial transmission and at least one incremental redundancy hybrid automatic repeat request (IR-HARQ) retransmission; means for forming a plurality of log likelihood ratios (LLRs) based on the packets; means for compressing the plurality of LLRs, including: quantizing a first LLR to three levels; quantizing a second LLR to five levels; and mapping the first quantized three-level LLR and the second quantized five-level LLR to four bits using a lookup table (LUT); and means for buffering the compressed plurality of LLRs.

15. The apparatus of claim 12 , further comprising means for combining the buffered compressed plurality of LLRs using IR combining.

16. The apparatus of claim 12 , wherein the buffered compressed plurality of LLRs comprise systematic bits and redundancy bits.

17. An apparatus having reduced buffer overhead, comprising: means for receiving a radio link control (RLC) retransmission comprising one or more transmission blocks on at least one of multiple component carriers (CCs) or multiple hybrid automatic repeat request (HARQ) interlaces; means for receiving at least one RLC parity packet associated with the RLC retransmission on at least one of a different CC or a different HARQ interlace than the RLC retransmission; means for attempting to decode the one or more transmission blocks; means for determining whether the one or more transmission blocks were successfully decoded; means for storing soft log likelihood ratios (LLRs) associated with transmission blocks that failed to successfully decode in a shared buffer; and means for storing transmission blocks that were successfully decoded out-of-order in the shared buffer.

18. The apparatus of claim 17 , wherein the shared buffer comprises a joint HARQ LLR and radio link control (RLC) reordering buffer.

19. The apparatus of claim 17 , wherein the shared buffer comprises dynamic partitioning memory.